20498 has 8 divisors (see below), whose sum is σ = 31692. Its totient is φ = 9936.

The previous prime is 20483. The next prime is 20507. The reversal of 20498 is 89402.

It can be written as a sum of positive squares in 2 ways, for example, as 20449 + 49 = 143^2 + 7^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 11.

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65 + ... + 212.

2²⁰⁴⁹⁸ is an apocalyptic number.

20498 is a deficient number, since it is larger than the sum of its proper divisors (11194).

20498 is a wasteful number, since it uses less digits than its factorization.

20498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 20498 is about 143.1712261594. The cubic root of 20498 is about 27.3676283119.

The spelling of 20498 in words is "twenty thousand, four hundred ninety-eight".